Geographical location, soil, weather, climate, rain, day length, growing season, determines what you can grow and how well it grows. My locations is 30 miles south of Nashville TN. Our last frost is April 20 and first frost is Nov 5. We typically have 47" of rain every year January to May. We go from 32° April 1st to 95° June 15 we have a very short spring.
Each plant needs its own, fertilizer, water, sun, requirements.
Melons, sweet potatoes, okra, red potatoes, love hot weather full sun all day. Red potatoes need 5-20-20 fertilizer. Sweet potatoes & okra never seem to care if they get fertilizer. Sometimes I give melons 15-15-15 fertilizer but they don't seem to care about fertilizer wither.
Tomatoes & potatoes do best for ME in 100°F weather with 5 hours of early morning sun they shade the rest of the day.
If tomatoes & potatoes get too much nitrogen I get very large plants and not many tomatoes or potatoes. 5-20-20 fertilizer is good.
Beans do best for me in full sun all day several 40 ft long rows 12" between rows. 15-15-15 fertilizer is best.
Tomatoes do best for me stakes not caged. For some reason cages cause blight? Maybe not enough air flow??? I typically get 30 to 40 lbs of tomatoes from each plant.
Peppers need soft soil roots need to grow large to support a large plant.
CORN, super sweet corn is usually a 72 day crop germination is usually not good about 50% some times less. If you have a short growing season you only be able to grow 72 to 90 day corn. 72 day corn plants are short 5 & 6' tall ears are small 6" long. 90 day corn is 7 ft tall with 7 to 8" long. If you grow 100 plants of 90 day corn you need to grow 200 plants of 72 day corn to get the same harvest of kernels. Corn need 40-0-0 fertilizer 1 week before planting. When corn is knee high corn needs 1 lb of Urea = 40-0-0 fertilizer for every 40 feet of corn. When ears have silks you need to fertilize with Urea again 1 lb for every 40 ft.
I don't grow squash bugs kill it quick we often only get 1 squash per plant.
Cucumbers are a bug magnet in my garden they attract so many bugs the whole garden has bugs but if I don't grow cucumbers the rest of the garden seldom has many bugs.
BER = Blossom End Rot can be a problem for, melons, tomatoes, squash, peppers, cucumbers.
Hard neck garlic is easy to grow put garlic in refrigerator July 1st then plant it in the garden Sept it starts growing tops on 4 days. I feed it 15-15-15 fertilizer, harvest is about first week of June.
Intermediate Candy Onion PLANTS not sets grow best in TN. Plants are 2 to 3 months old, set are already 1 year old, plants will grow 3" diameter onions. I plant onions March 1st they need 21-0-0 fertilizer until day length 12 hr hours long or tempers are 90°F then switch to a different fertilizer, 0-20-20. Try to grow 9 to 10 leaves with nitrogen they grow large bulbs with P&K. My onion bed 32" x 25 ft needs 50 gallons of water once a week when growing bulbs.
I can't grow lettuce in our weather but I can grow Pac Choy.
Carrots grow good only if I can get seeds to germinate Feb 1st.
Peas don't grow well here if I plant 1 lbs of seeds I can harvest 1 lb of peas a few months later. I can do better to eat pea seeds and not grow them.
WHEN I lived in Phoenix AZ I plants my garden Nov 1st I grew 18 lb cabbage heads. Everything grow so large and so easy except corn. Corn will not pollinate in extremely low humidity climate. 8 ft tall plants with ears and no kernels.